﻿GET_GEVOMechL2_09_01_01_53 - STEP-BY-STEP Screen
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After achieving a TIR of less than 0.0005 inches (0.0127 mm), apply 0.015-inch (0.381-mm) shims to both top right and left mounting flanges.

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This will put position C in compression and relieve pressure on the #7 main bearing.

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<b>Caution:</b> Do not take the dial indicator web deflection measurements while the engine is cooling down from recent operation.

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The engine must be at shop temperature when the web deflection measurements are taken and engine-alternator alignment is adjusted.

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On a warm engine, over the span of less than a minute, the displayed reading on a mounted, undisturbed 0.0001-inch (0.00254-mm) resolution dial indicator will change appreciably as the crankshaft contracts with engine cooling.

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Typical steps to compress the crankshaft web are as follows:

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1. Use the air impact wrench to loosen all four alternator top flange mounting bolts.

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2. Install and tighten a jack bolt on either the right or left mounting flange to slightly pry the alternator apart from the engine.

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3. Install 0.015-inch (0.381-mm) shims to both the top right and top left flanges.

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4. Remove the jack bolt.
